Black Ace Dual Pitch Roller Chain Sprockets are produced with the best integrity. You will understand worth, as these sprockets are flame-cut and machined with the highest precision available on the market.
ANSI Standard Torch Profiles
A – B – C Hub Types
A SORT (no hub) typically found in weld-on applications.
B Type (hub on one side) used in applications where clearance width is narrow. More economical than C Type.
C Type (hub on both sides) used in applications where B Type is not wide enough to withstand torques produced by drive.
Split Style Structure – Once you use a Split Sprocket, you might never want to employ a setscrew mount design again. Removal or installation is a breeze. Can be used in virtually all applications. An additional benefit to Dark Ace’s split sprockets is certainly that the shaft/keyway protection 
is much tighter than a typical setscrew mount.
Hardening Available – Flame hardening of sprockets is available as a choice.